CCTA双低扫描对冠脉支架显示影响的实验研究

发布时间：2018-05-26 07:47

本文选题：冠状动脉 + 支架　；参考：《放射学实践》2017年01期

【摘要】：目的:探讨双低扫描方案对冠脉支架显示的影响。方法:选取不同类型8枚支架放置于模拟冠脉血管的体外模型中,分次注入不同碘浓度对比剂(浓度分别为270和350mg I/mL),管电压分别为80和120kV,记为双低扫描组和常规扫描组,行新双源CT冠状动脉扫描,并对两组图像质量进行主观评分和客观评价。结果:双低扫描组与常规扫描组在图像质量主观评分(P=0.102)及背景噪声(P=0.068)方面差异均无统计学意义,双低扫描可以获得满足诊断要求的冠状动脉CTA图像;晕状伪影程度方面两组间差异无统计学意义(P=0.624);双低扫描组支架内腔衰减差异明显低于常规扫描组,差异有统计学意义(P0.05),双低扫描组支架腔内与支架CT值差异更大,更有助于对支架内再狭窄形成的诊断。双低扫描组支架内径差异明显低于常规扫描组,差异有统计学意义(P0.05),双低扫描组对支架形态、管径的显示优于常规扫描组。双低扫描组辐射剂量为0.32mSv,常规扫描组为0.47mSv,双低扫描可有效降低辐射剂量。结论:采用低浓度对比剂配合低管电压的扫描方式可在保证图像质量的同时有效降低辐射剂量,对冠脉支架内腔及支架形态的显示优于常规扫描。
[Abstract]:Objective: to investigate the effect of double low scan regimen on coronary stent display. Methods: eight stents of different types were selected to be placed in a coronary artery model in vitro and injected with different iodine concentrations ( and 350mg I / mL, respectively), and the tube voltages were 80 and 120kV, respectively, which were recorded as double low scan group and routine scanning group. New double source CT coronary artery scanning was performed, and subjective evaluation and objective evaluation of the image quality of the two groups were carried out. Results: there was no significant difference between double low scan group and routine scanning group in subjective score of image quality (P 0. 102) and background noise (P 0. 068). Double low scan could obtain coronary artery CTA images which met the diagnostic requirements. There was no significant difference in the degree of halo artifacts between the two groups, while the attenuation of stent cavity in double low scan group was significantly lower than that in conventional scanning group, and the difference was statistically significant (P 0.05), and the difference between double low scan group and stent CT value was greater than that in double low scan group. It is helpful for the diagnosis of restenosis in stent. The difference of stent diameter in double low scan group was significantly lower than that in conventional scanning group, and the difference was statistically significant (P 0.05). The display of stent shape and diameter in double low scan group was better than that in routine scanning group. The radiation dose was 0.32 mSv in double low scan group and 0.47 mSv in conventional scanning group. Conclusion: the low concentration contrast agent combined with low tube voltage can effectively reduce the radiation dose while ensuring the image quality, and the display of coronary stent lumen and stent morphology is superior to that of conventional scanning.
【作者单位】：中国医科大学附属第一医院放射科;西门子医疗CT事业部;
【分类号】：R816.2

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